Note: Unless you are using a severely outdated operating system or CPU, you most likely want to always download the x64 (64-bit) version of Ultimate Doom Builder.
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
The 64-bit version has less limitations on the total size of the project that you can load and edit, while the x86 (32-bit) version of Ultimate Doom Builder only exists for compatibility with older PCs.
If not sure, follow these instructions to find out whether your system is 64-bit: Which version of Windows operating system am I running?
All recent versions
Ultimate Doom Builder R4220
27 Mar 2025
Sound Environment Mode: inserting a sound environment thing will now apply "clean" thing properties instead of the ones of the last edited thing. Fixes #1175
Ultimate Doom Builder R4219
27 Mar 2025
Sound Environment Mode: improved performance
Ultimate Doom Builder R4217
15 Mar 2025
ZScript parser: added support for new GZDoom 4.15 ZScript syntax. Fixes #1170
Ultimate Doom Builder R4215
22 Feb 2025
Added info about Windows 11 support (#1165)
Ultimate Doom Builder R4214
22 Feb 2025
CVARINFO: added support for HandlerClass. Fixes #1151